从经济学的角度看,初级产品的价格不稳定的原因是( )。
A.初级产品价值低
B.初级产品的需求的变动
C.初级产品的供给的变动
D.发达国家的经济制裁
E.世界经济危机的后续影响
正确答案是BC
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Helen's brother is a big man of about forty, wide-shouldered and ( ) built.(heavy)
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